Charge Dynamics at Heterojunction between Face-on/Edge-on PCPDTBT and PCBM Bilayer: Interplay of Donor/Acceptor Distance and Local Charge Carrier Mobility
Charge Dynamics at Heterojunction between Face-on/Edge-on PCPDTBT and PCBM Bilayer: Interplay of Donor/Acceptor Distance and Local Charge Carrier Mobility
复制标题
DOI：
10.1021/acs.jpcc.6b04827
复制
发表时间：
2016-08
影响因子：
3.7
通讯作者：
Yoshiki Shimata;Marina Ide;M. Tashiro;Michio Katouda;Y. Imamura;A. Saeki
中科院分区：
文献类型：
--
作者：
Yoshiki Shimata;Marina Ide;M. Tashiro;Michio Katouda;Y. Imamura;A. Saeki
本体异质结有机太阳能电池作为一种具有成本效益的能量收集装置已显示出很大的前景，尽管最近在提高功率转换效率方面取得了进展，但电子供体和电子受体界面的关键光物理过程仍然是持续争论的主题。在这里，我们研究了环戊二噻吩-苯并噻二唑共聚物（PCPDTBT）的聚合物取向对聚合物和亚甲基富勒烯（PCBM）双层异质结处电荷分离（CS）和复合（CR）的影响。通过闪光光解时间分辨微波电导率 (TRMC) 监测通过侧烷基链修饰控制的对比富面或边缘界面处的载流子动力学。使用单线态激子扩散到供体-受体界面并在高激发密度下使用猝灭项来分析数据。我们表明，对于面丰富的界面，CS 比边缘界面更有效，而 CR 对于后者则相反。随着计算...
The bulk heterojunction organic solar cell has shown much promise as a cost-effective energy harvesting device, while despite recent progress in boosted power conversion efficiency, critical photophysical process at the interface of electron donor and electron acceptor is subject of ongoing debate. Here we investigate the impact of polymer orientation of cychlopentadithiophene–benzothiadiazole copolymer (PCPDTBT) on the charge separation (CS) and recombination (CR) at the bilayer heterojunction of polymer and methanofullerene (PCBM). The charge carrier dynamics at contrasting face-on-rich or edge-on interface controlled via side-alkyl chain modification are monitored by flash-photolysis time-resolved microwave conductivity (TRMC). The data are analyzed using singlet exciton diffusion to donor–acceptor interface with quenching term at high excitation density. We show that CS is more efficient for the face-on-rich interface than edge-on, while CR is in turn retarded for the latter. Along with computational ...